Analysis
An immediate lesson
from this puzzle is the realization that slope values of a curve transmit technical information. In this case, the butterfly valve allows about 5% of the maximum
flow when the valve is 30% on the way to completely open. However, the other
valve at the same 30% open position will permit about 45% of the maximum flow
through the valve. From the opposite perspective, the curves also indicate at
the 50% fluid flow position, the butterfly valve has to be 70% open, but the
other valve only needs to be about 32% open.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieM3oe_SxhXCBWqV4_8Cr29YhvONhau5BqHdOwRZUzizyYWyFCevXuepsPLQycOUJO8qe__P_U2kvWJ3infa0lZHpW4QNz8Tzome4tB6mTaZb2f6f_KuA0CAJpklV8oy2ovbhylqtVOpkn/s200/Butterfly_valve.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieM3oe_SxhXCBWqV4_8Cr29YhvONhau5BqHdOwRZUzizyYWyFCevXuepsPLQycOUJO8qe__P_U2kvWJ3infa0lZHpW4QNz8Tzome4tB6mTaZb2f6f_KuA0CAJpklV8oy2ovbhylqtVOpkn/s200/Butterfly_valve.png)
The puzzle also provides
a segway for an introduction to valves. In this case, the Butterfly valve is a
common rotating valve while the other valve is actually a stem driven valve
that goes up/down to open/close the flow channel. There is enough Google based
information with pictures of various valves to make a PowerPoint presentation. For
more advanced students, valve components (trim, etc,) and valve coefficient, Cv,
can be introduced as well.
Solution
The technician installed the
“U-Becth-Em V222.
Answer: NO
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